den-shore



(No Model.) 2 Sheets-Sheet. 1. A DBNSMORE TYPE WRITING MACHINE.

Patented Dec. 8 1891.

2 Sheets-Sheet 2.

R m m A M SG NW. mm .W AB P Y T (No Model.)

No. 464,752. Patented Dec. 8, 1891.

UNITED STATES PATENT OFFICE.

AMOS DENSMORE, OF NElV YORK, N. Y.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 464,752, dated December 8, 1891.

Application filed Tune 3, 1891. Serial No. 395,004. (No model.)

To all whom, it may concern.-

Be it known that I, AMOS DENSMORE, a citizen of the United States, residing in the city, county, and State of New York, have invented new and useful Improvements in Type-Writing Machines, of which the following is a specification.

This invention for improvements in typewriting machines particularly relates to the frame for the platen and to the parts on which the said frame is in turn supported and with and relative to which it moves, the object being to construct the said parts in a most economical and practicable manner, consistent with as great efficiency ashas heretofore been found in structures of this class. The platenframe is, under the construction embodied in the present invention, capable of being readily bodily removed from the machine for the purposes of cleansing or otherwise ing as readily replaced.

The invention consists in the construction and combination of parts, all substantially as will hereinafter more fully appeariand be set forth in the claims.

Reference is to be had to the accompanying drawings, in which- Figure l is a sectional elevation of the frame of a type-writin g machine, the carriage, and platen-supporting frame, together with some other coacting parts. Fig. 2 is a perspective view of the platen-frame; and Fig. 3 is a perspective view of apart of the m achineframe and carriage thereon.

In the drawings, A represents the frame of the type-writing machine, and B represents the carriage, which is movable endwise as to the length of itself and of the frame A, as usual, the means for imparting the endwise movement intermittently in one direction, and the reverse movement, usually consist ing of escapement devices and a drum and band not here shown, as such form no part of the present invention. The carriage B has its engagement with the long slide-rail a, which is horizontally supported at the rear of the machine-frame by means of the apertured engaging-lugs b b.

0 represents the shift-rail, the same being mounted or supported at the front of the machine and parallel with the rail a in suband of bestantially the usual manner, or in any suit-- able manner whereby the rail may be bodily moved forward and backward. As shown, the rail 0 is carried at the upper ends of arms 61 cl, which form parts of intermediately-pivoted levers, which by their lower ends are secured to the connecting-rods g attached to the key-lever h, the spring 2' being applied to return the parts to their normal position.

D represents the platen-fram e, having suitable bearings, as at j, for the journals of the platen, indicated by 00. The platen-frame is of a general rectangular form and has its forward portion constituted by the longitudinally-running section Z, which is of trough form, the hollow or concavity therein being lowermost, and the same, as clearly indicated in Fig. 1, engages and is free to slide along on the shift-rail C, but to be moved forward or backward across the length of the shiftrail when thelatter is so moved. The section Z of the platen-frame is apertured through the top thereof, as indicated at k k in Fig. 2, and the hangers m are secured on the said section Z at the borders of the apertures 70 and support the flanged friction-rollers n, which bear upon the top of the shift-rail through the apertures.-

Vhile the engagement of the platen-frame with the shift-rail may be had by the troughshaped part Z of the said frame, in practice the substantial engagement is had by the flanges on the friction-rolls, and the trough formation may be dispensed with.

o 0 represent bifurcated lugs, which are formed upon or attached to the rear part of the platen-frame and embrace the rail a, and are so arranged adjacent and in engagement with the said lugs 12 b of the carriage B that as the latter is moved endwise the platenframe will be correspondingly moved. The platen-frame is, of course, due to its sliding. engagement with the raila, free to be moved 7 forward and back independently of the car.-

riage as the shift-rail is moved.

On desiring 'to remove the platen-frame from the machine the same may readily be done by swinging up the front portion to free it from the shift-rail, and then drawing forwardly, the frame may be disengaged from the rear rail a and thecarriage.

\Vhat I claim is- 1. In a type-writing machine, the combination, with a forwardly and rearwardly movtoo able horizontal shift-rail, and the carriage movable endwise, of a platen supporting frame having an engagement with the shiftrail, being, however, free to move endwise along same,but constrained fora forward and backward movement therewith, and said frame having lugs 0 0, which extend to rest upon a suitable support, being free t'or1novewent forward and backward, and abutments on said carriage with which said platen-frame lugs engage, whereby when the carriage is moved endwise the platen-frame \villbe moved therewith, for the purposes set forth.

2. In a type-writing machine, the combination, with a forwardly and rearwardly movable sl1ift-rail and the rail a, and the car- AMOS DENSMORE.

Witnesses:

C. G. ALDEN, C. GODFREY PATTERSON. 

